Ghosts can never be scientifically proven because its outside the realm of science. Ghosts are supernatural and Science can not explain or prove anything about the supernatural. Just like the question is God real? or are there such thing as demons? or the devil? or angels? Science can not prove such things. Science is a methodology, a tool used to better explain the physical universe. In science there are laws, theories, and hypothesis, and so on and so on, but basically ghosts will never be scientifically proven due to the supernatural being outside the realm of science